zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/xfs/xfs_qm.c b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_qm.c
new file mode 100644
index 0000000..55c6afe
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/xfs/xfs_qm.c
@@ -0,0 +1,1902 @@
+/*
+ * Copyright (c) 2000-2005 Silicon Graphics, Inc.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ */
+#include "xfs.h"
+#include "xfs_fs.h"
+#include "xfs_bit.h"
+#include "xfs_log.h"
+#include "xfs_inum.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_alloc.h"
+#include "xfs_quota.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_dinode.h"
+#include "xfs_inode.h"
+#include "xfs_ialloc.h"
+#include "xfs_itable.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_bmap.h"
+#include "xfs_attr.h"
+#include "xfs_buf_item.h"
+#include "xfs_trans_space.h"
+#include "xfs_utils.h"
+#include "xfs_qm.h"
+#include "xfs_trace.h"
+
+/*
+ * The global quota manager. There is only one of these for the entire
+ * system, _not_ one per file system. XQM keeps track of the overall
+ * quota functionality, including maintaining the freelist and hash
+ * tables of dquots.
+ */
+STATIC int xfs_qm_init_quotainos(xfs_mount_t *);
+STATIC int xfs_qm_init_quotainfo(xfs_mount_t *);
+STATIC int xfs_qm_shake(struct shrinker *, struct shrink_control *);
+
+/*
+ * We use the batch lookup interface to iterate over the dquots as it
+ * currently is the only interface into the radix tree code that allows
+ * fuzzy lookups instead of exact matches. Holding the lock over multiple
+ * operations is fine as all callers are used either during mount/umount
+ * or quotaoff.
+ */
+#define XFS_DQ_LOOKUP_BATCH 32
+
+STATIC int
+xfs_qm_dquot_walk(
+ struct xfs_mount *mp,
+ int type,
+ int (*execute)(struct xfs_dquot *dqp))
+{
+ struct xfs_quotainfo *qi = mp->m_quotainfo;
+ struct radix_tree_root *tree = XFS_DQUOT_TREE(qi, type);
+ uint32_t next_index;
+ int last_error = 0;
+ int skipped;
+ int nr_found;
+
+restart:
+ skipped = 0;
+ next_index = 0;
+ nr_found = 0;
+
+ while (1) {
+ struct xfs_dquot *batch[XFS_DQ_LOOKUP_BATCH];
+ int error = 0;
+ int i;
+
+ mutex_lock(&qi->qi_tree_lock);
+ nr_found = radix_tree_gang_lookup(tree, (void **)batch,
+ next_index, XFS_DQ_LOOKUP_BATCH);
+ if (!nr_found) {
+ mutex_unlock(&qi->qi_tree_lock);
+ break;
+ }
+
+ for (i = 0; i < nr_found; i++) {
+ struct xfs_dquot *dqp = batch[i];
+
+ next_index = be32_to_cpu(dqp->q_core.d_id) + 1;
+
+ error = execute(batch[i]);
+ if (error == EAGAIN) {
+ skipped++;
+ continue;
+ }
+ if (error && last_error != EFSCORRUPTED)
+ last_error = error;
+ }
+
+ mutex_unlock(&qi->qi_tree_lock);
+
+ /* bail out if the filesystem is corrupted. */
+ if (last_error == EFSCORRUPTED) {
+ skipped = 0;
+ break;
+ }
+ }
+
+ if (skipped) {
+ delay(1);
+ goto restart;
+ }
+
+ return last_error;
+}
+
+
+/*
+ * Purge a dquot from all tracking data structures and free it.
+ */
+STATIC int
+xfs_qm_dqpurge(
+ struct xfs_dquot *dqp)
+{
+ struct xfs_mount *mp = dqp->q_mount;
+ struct xfs_quotainfo *qi = mp->m_quotainfo;
+ struct xfs_dquot *gdqp = NULL;
+
+ xfs_dqlock(dqp);
+ if ((dqp->dq_flags & XFS_DQ_FREEING) || dqp->q_nrefs != 0) {
+ xfs_dqunlock(dqp);
+ return EAGAIN;
+ }
+
+ /*
+ * If this quota has a group hint attached, prepare for releasing it
+ * now.
+ */
+ gdqp = dqp->q_gdquot;
+ if (gdqp) {
+ xfs_dqlock(gdqp);
+ dqp->q_gdquot = NULL;
+ }
+
+ dqp->dq_flags |= XFS_DQ_FREEING;
+
+ /*
+ * If we're turning off quotas, we have to make sure that, for
+ * example, we don't delete quota disk blocks while dquots are
+ * in the process of getting written to those disk blocks.
+ * This dquot might well be on AIL, and we can't leave it there
+ * if we're turning off quotas. Basically, we need this flush
+ * lock, and are willing to block on it.
+ */
+ if (!xfs_dqflock_nowait(dqp)) {
+ /*
+ * Block on the flush lock after nudging dquot buffer,
+ * if it is incore.
+ */
+ xfs_dqflock_pushbuf_wait(dqp);
+ }
+
+ /*
+ * If we are turning this type of quotas off, we don't care
+ * about the dirty metadata sitting in this dquot. OTOH, if
+ * we're unmounting, we do care, so we flush it and wait.
+ */
+ if (XFS_DQ_IS_DIRTY(dqp)) {
+ int error;
+
+ /*
+ * We don't care about getting disk errors here. We need
+ * to purge this dquot anyway, so we go ahead regardless.
+ */
+ error = xfs_qm_dqflush(dqp, SYNC_WAIT);
+ if (error)
+ xfs_warn(mp, "%s: dquot %p flush failed",
+ __func__, dqp);
+ xfs_dqflock(dqp);
+ }
+
+ ASSERT(atomic_read(&dqp->q_pincount) == 0);
+ ASSERT(XFS_FORCED_SHUTDOWN(mp) ||
+ !(dqp->q_logitem.qli_item.li_flags & XFS_LI_IN_AIL));
+
+ xfs_dqfunlock(dqp);
+ xfs_dqunlock(dqp);
+
+ radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
+ be32_to_cpu(dqp->q_core.d_id));
+ qi->qi_dquots--;
+
+ /*
+ * We move dquots to the freelist as soon as their reference count
+ * hits zero, so it really should be on the freelist here.
+ */
+ mutex_lock(&qi->qi_lru_lock);
+ ASSERT(!list_empty(&dqp->q_lru));
+ list_del_init(&dqp->q_lru);
+ qi->qi_lru_count--;
+ XFS_STATS_DEC(xs_qm_dquot_unused);
+ mutex_unlock(&qi->qi_lru_lock);
+
+ xfs_qm_dqdestroy(dqp);
+
+ if (gdqp)
+ xfs_qm_dqput(gdqp);
+ return 0;
+}
+
+/*
+ * Purge the dquot cache.
+ */
+void
+xfs_qm_dqpurge_all(
+ struct xfs_mount *mp,
+ uint flags)
+{
+ if (flags & XFS_QMOPT_UQUOTA)
+ xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_dqpurge);
+ if (flags & XFS_QMOPT_GQUOTA)
+ xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_dqpurge);
+ if (flags & XFS_QMOPT_PQUOTA)
+ xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_dqpurge);
+}
+
+/*
+ * Just destroy the quotainfo structure.
+ */
+void
+xfs_qm_unmount(
+ struct xfs_mount *mp)
+{
+ if (mp->m_quotainfo) {
+ xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
+ xfs_qm_destroy_quotainfo(mp);
+ }
+}
+
+
+/*
+ * This is called from xfs_mountfs to start quotas and initialize all
+ * necessary data structures like quotainfo. This is also responsible for
+ * running a quotacheck as necessary. We are guaranteed that the superblock
+ * is consistently read in at this point.
+ *
+ * If we fail here, the mount will continue with quota turned off. We don't
+ * need to inidicate success or failure at all.
+ */
+void
+xfs_qm_mount_quotas(
+ xfs_mount_t *mp)
+{
+ int error = 0;
+ uint sbf;
+
+ /*
+ * If quotas on realtime volumes is not supported, we disable
+ * quotas immediately.
+ */
+ if (mp->m_sb.sb_rextents) {
+ xfs_notice(mp, "Cannot turn on quotas for realtime filesystem");
+ mp->m_qflags = 0;
+ goto write_changes;
+ }
+
+ ASSERT(XFS_IS_QUOTA_RUNNING(mp));
+
+ /*
+ * Allocate the quotainfo structure inside the mount struct, and
+ * create quotainode(s), and change/rev superblock if necessary.
+ */
+ error = xfs_qm_init_quotainfo(mp);
+ if (error) {
+ /*
+ * We must turn off quotas.
+ */
+ ASSERT(mp->m_quotainfo == NULL);
+ mp->m_qflags = 0;
+ goto write_changes;
+ }
+ /*
+ * If any of the quotas are not consistent, do a quotacheck.
+ */
+ if (XFS_QM_NEED_QUOTACHECK(mp)) {
+ error = xfs_qm_quotacheck(mp);
+ if (error) {
+ /* Quotacheck failed and disabled quotas. */
+ return;
+ }
+ }
+ /*
+ * If one type of quotas is off, then it will lose its
+ * quotachecked status, since we won't be doing accounting for
+ * that type anymore.
+ */
+ if (!XFS_IS_UQUOTA_ON(mp))
+ mp->m_qflags &= ~XFS_UQUOTA_CHKD;
+ if (!(XFS_IS_GQUOTA_ON(mp) || XFS_IS_PQUOTA_ON(mp)))
+ mp->m_qflags &= ~XFS_OQUOTA_CHKD;
+
+ write_changes:
+ /*
+ * We actually don't have to acquire the m_sb_lock at all.
+ * This can only be called from mount, and that's single threaded. XXX
+ */
+ spin_lock(&mp->m_sb_lock);
+ sbf = mp->m_sb.sb_qflags;
+ mp->m_sb.sb_qflags = mp->m_qflags & XFS_MOUNT_QUOTA_ALL;
+ spin_unlock(&mp->m_sb_lock);
+
+ if (sbf != (mp->m_qflags & XFS_MOUNT_QUOTA_ALL)) {
+ if (xfs_qm_write_sb_changes(mp, XFS_SB_QFLAGS)) {
+ /*
+ * We could only have been turning quotas off.
+ * We aren't in very good shape actually because
+ * the incore structures are convinced that quotas are
+ * off, but the on disk superblock doesn't know that !
+ */
+ ASSERT(!(XFS_IS_QUOTA_RUNNING(mp)));
+ xfs_alert(mp, "%s: Superblock update failed!",
+ __func__);
+ }
+ }
+
+ if (error) {
+ xfs_warn(mp, "Failed to initialize disk quotas.");
+ return;
+ }
+}
+
+/*
+ * Called from the vfsops layer.
+ */
+void
+xfs_qm_unmount_quotas(
+ xfs_mount_t *mp)
+{
+ /*
+ * Release the dquots that root inode, et al might be holding,
+ * before we flush quotas and blow away the quotainfo structure.
+ */
+ ASSERT(mp->m_rootip);
+ xfs_qm_dqdetach(mp->m_rootip);
+ if (mp->m_rbmip)
+ xfs_qm_dqdetach(mp->m_rbmip);
+ if (mp->m_rsumip)
+ xfs_qm_dqdetach(mp->m_rsumip);
+
+ /*
+ * Release the quota inodes.
+ */
+ if (mp->m_quotainfo) {
+ if (mp->m_quotainfo->qi_uquotaip) {
+ IRELE(mp->m_quotainfo->qi_uquotaip);
+ mp->m_quotainfo->qi_uquotaip = NULL;
+ }
+ if (mp->m_quotainfo->qi_gquotaip) {
+ IRELE(mp->m_quotainfo->qi_gquotaip);
+ mp->m_quotainfo->qi_gquotaip = NULL;
+ }
+ }
+}
+
+STATIC int
+xfs_qm_dqattach_one(
+ xfs_inode_t *ip,
+ xfs_dqid_t id,
+ uint type,
+ uint doalloc,
+ xfs_dquot_t *udqhint, /* hint */
+ xfs_dquot_t **IO_idqpp)
+{
+ xfs_dquot_t *dqp;
+ int error;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ error = 0;
+
+ /*
+ * See if we already have it in the inode itself. IO_idqpp is
+ * &i_udquot or &i_gdquot. This made the code look weird, but
+ * made the logic a lot simpler.
+ */
+ dqp = *IO_idqpp;
+ if (dqp) {
+ trace_xfs_dqattach_found(dqp);
+ return 0;
+ }
+
+ /*
+ * udqhint is the i_udquot field in inode, and is non-NULL only
+ * when the type arg is group/project. Its purpose is to save a
+ * lookup by dqid (xfs_qm_dqget) by caching a group dquot inside
+ * the user dquot.
+ */
+ if (udqhint) {
+ ASSERT(type == XFS_DQ_GROUP || type == XFS_DQ_PROJ);
+ xfs_dqlock(udqhint);
+
+ /*
+ * No need to take dqlock to look at the id.
+ *
+ * The ID can't change until it gets reclaimed, and it won't
+ * be reclaimed as long as we have a ref from inode and we
+ * hold the ilock.
+ */
+ dqp = udqhint->q_gdquot;
+ if (dqp && be32_to_cpu(dqp->q_core.d_id) == id) {
+ ASSERT(*IO_idqpp == NULL);
+
+ *IO_idqpp = xfs_qm_dqhold(dqp);
+ xfs_dqunlock(udqhint);
+ return 0;
+ }
+
+ /*
+ * We can't hold a dquot lock when we call the dqget code.
+ * We'll deadlock in no time, because of (not conforming to)
+ * lock ordering - the inodelock comes before any dquot lock,
+ * and we may drop and reacquire the ilock in xfs_qm_dqget().
+ */
+ xfs_dqunlock(udqhint);
+ }
+
+ /*
+ * Find the dquot from somewhere. This bumps the
+ * reference count of dquot and returns it locked.
+ * This can return ENOENT if dquot didn't exist on
+ * disk and we didn't ask it to allocate;
+ * ESRCH if quotas got turned off suddenly.
+ */
+ error = xfs_qm_dqget(ip->i_mount, ip, id, type,
+ doalloc | XFS_QMOPT_DOWARN, &dqp);
+ if (error)
+ return error;
+
+ trace_xfs_dqattach_get(dqp);
+
+ /*
+ * dqget may have dropped and re-acquired the ilock, but it guarantees
+ * that the dquot returned is the one that should go in the inode.
+ */
+ *IO_idqpp = dqp;
+ xfs_dqunlock(dqp);
+ return 0;
+}
+
+
+/*
+ * Given a udquot and gdquot, attach a ptr to the group dquot in the
+ * udquot as a hint for future lookups.
+ */
+STATIC void
+xfs_qm_dqattach_grouphint(
+ xfs_dquot_t *udq,
+ xfs_dquot_t *gdq)
+{
+ xfs_dquot_t *tmp;
+
+ xfs_dqlock(udq);
+
+ tmp = udq->q_gdquot;
+ if (tmp) {
+ if (tmp == gdq)
+ goto done;
+
+ udq->q_gdquot = NULL;
+ xfs_qm_dqrele(tmp);
+ }
+
+ udq->q_gdquot = xfs_qm_dqhold(gdq);
+done:
+ xfs_dqunlock(udq);
+}
+
+
+/*
+ * Given a locked inode, attach dquot(s) to it, taking U/G/P-QUOTAON
+ * into account.
+ * If XFS_QMOPT_DQALLOC, the dquot(s) will be allocated if needed.
+ * Inode may get unlocked and relocked in here, and the caller must deal with
+ * the consequences.
+ */
+int
+xfs_qm_dqattach_locked(
+ xfs_inode_t *ip,
+ uint flags)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ uint nquotas = 0;
+ int error = 0;
+
+ if (!XFS_IS_QUOTA_RUNNING(mp) ||
+ !XFS_IS_QUOTA_ON(mp) ||
+ !XFS_NOT_DQATTACHED(mp, ip) ||
+ ip->i_ino == mp->m_sb.sb_uquotino ||
+ ip->i_ino == mp->m_sb.sb_gquotino)
+ return 0;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+
+ if (XFS_IS_UQUOTA_ON(mp)) {
+ error = xfs_qm_dqattach_one(ip, ip->i_d.di_uid, XFS_DQ_USER,
+ flags & XFS_QMOPT_DQALLOC,
+ NULL, &ip->i_udquot);
+ if (error)
+ goto done;
+ nquotas++;
+ }
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ if (XFS_IS_OQUOTA_ON(mp)) {
+ error = XFS_IS_GQUOTA_ON(mp) ?
+ xfs_qm_dqattach_one(ip, ip->i_d.di_gid, XFS_DQ_GROUP,
+ flags & XFS_QMOPT_DQALLOC,
+ ip->i_udquot, &ip->i_gdquot) :
+ xfs_qm_dqattach_one(ip, xfs_get_projid(ip), XFS_DQ_PROJ,
+ flags & XFS_QMOPT_DQALLOC,
+ ip->i_udquot, &ip->i_gdquot);
+ /*
+ * Don't worry about the udquot that we may have
+ * attached above. It'll get detached, if not already.
+ */
+ if (error)
+ goto done;
+ nquotas++;
+ }
+
+ /*
+ * Attach this group quota to the user quota as a hint.
+ * This WON'T, in general, result in a thrash.
+ */
+ if (nquotas == 2) {
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(ip->i_udquot);
+ ASSERT(ip->i_gdquot);
+
+ /*
+ * We do not have i_udquot locked at this point, but this check
+ * is OK since we don't depend on the i_gdquot to be accurate
+ * 100% all the time. It is just a hint, and this will
+ * succeed in general.
+ */
+ if (ip->i_udquot->q_gdquot != ip->i_gdquot)
+ xfs_qm_dqattach_grouphint(ip->i_udquot, ip->i_gdquot);
+ }
+
+ done:
+#ifdef DEBUG
+ if (!error) {
+ if (XFS_IS_UQUOTA_ON(mp))
+ ASSERT(ip->i_udquot);
+ if (XFS_IS_OQUOTA_ON(mp))
+ ASSERT(ip->i_gdquot);
+ }
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+#endif
+ return error;
+}
+
+int
+xfs_qm_dqattach(
+ struct xfs_inode *ip,
+ uint flags)
+{
+ int error;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_qm_dqattach_locked(ip, flags);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+ return error;
+}
+
+/*
+ * Release dquots (and their references) if any.
+ * The inode should be locked EXCL except when this's called by
+ * xfs_ireclaim.
+ */
+void
+xfs_qm_dqdetach(
+ xfs_inode_t *ip)
+{
+ if (!(ip->i_udquot || ip->i_gdquot))
+ return;
+
+ trace_xfs_dquot_dqdetach(ip);
+
+ ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_uquotino);
+ ASSERT(ip->i_ino != ip->i_mount->m_sb.sb_gquotino);
+ if (ip->i_udquot) {
+ xfs_qm_dqrele(ip->i_udquot);
+ ip->i_udquot = NULL;
+ }
+ if (ip->i_gdquot) {
+ xfs_qm_dqrele(ip->i_gdquot);
+ ip->i_gdquot = NULL;
+ }
+}
+
+/*
+ * This initializes all the quota information that's kept in the
+ * mount structure
+ */
+STATIC int
+xfs_qm_init_quotainfo(
+ xfs_mount_t *mp)
+{
+ xfs_quotainfo_t *qinf;
+ int error;
+ xfs_dquot_t *dqp;
+
+ ASSERT(XFS_IS_QUOTA_RUNNING(mp));
+
+ qinf = mp->m_quotainfo = kmem_zalloc(sizeof(xfs_quotainfo_t), KM_SLEEP);
+
+ /*
+ * See if quotainodes are setup, and if not, allocate them,
+ * and change the superblock accordingly.
+ */
+ if ((error = xfs_qm_init_quotainos(mp))) {
+ kmem_free(qinf);
+ mp->m_quotainfo = NULL;
+ return error;
+ }
+
+ INIT_RADIX_TREE(&qinf->qi_uquota_tree, GFP_NOFS);
+ INIT_RADIX_TREE(&qinf->qi_gquota_tree, GFP_NOFS);
+ mutex_init(&qinf->qi_tree_lock);
+
+ INIT_LIST_HEAD(&qinf->qi_lru_list);
+ qinf->qi_lru_count = 0;
+ mutex_init(&qinf->qi_lru_lock);
+
+ /* mutex used to serialize quotaoffs */
+ mutex_init(&qinf->qi_quotaofflock);
+
+ /* Precalc some constants */
+ qinf->qi_dqchunklen = XFS_FSB_TO_BB(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
+ ASSERT(qinf->qi_dqchunklen);
+ qinf->qi_dqperchunk = BBTOB(qinf->qi_dqchunklen);
+ do_div(qinf->qi_dqperchunk, sizeof(xfs_dqblk_t));
+
+ mp->m_qflags |= (mp->m_sb.sb_qflags & XFS_ALL_QUOTA_CHKD);
+
+ /*
+ * We try to get the limits from the superuser's limits fields.
+ * This is quite hacky, but it is standard quota practice.
+ *
+ * We look at the USR dquot with id == 0 first, but if user quotas
+ * are not enabled we goto the GRP dquot with id == 0.
+ * We don't really care to keep separate default limits for user
+ * and group quotas, at least not at this point.
+ *
+ * Since we may not have done a quotacheck by this point, just read
+ * the dquot without attaching it to any hashtables or lists.
+ */
+ error = xfs_qm_dqread(mp, 0,
+ XFS_IS_UQUOTA_RUNNING(mp) ? XFS_DQ_USER :
+ (XFS_IS_GQUOTA_RUNNING(mp) ? XFS_DQ_GROUP :
+ XFS_DQ_PROJ),
+ XFS_QMOPT_DOWARN, &dqp);
+ if (!error) {
+ xfs_disk_dquot_t *ddqp = &dqp->q_core;
+
+ /*
+ * The warnings and timers set the grace period given to
+ * a user or group before he or she can not perform any
+ * more writing. If it is zero, a default is used.
+ */
+ qinf->qi_btimelimit = ddqp->d_btimer ?
+ be32_to_cpu(ddqp->d_btimer) : XFS_QM_BTIMELIMIT;
+ qinf->qi_itimelimit = ddqp->d_itimer ?
+ be32_to_cpu(ddqp->d_itimer) : XFS_QM_ITIMELIMIT;
+ qinf->qi_rtbtimelimit = ddqp->d_rtbtimer ?
+ be32_to_cpu(ddqp->d_rtbtimer) : XFS_QM_RTBTIMELIMIT;
+ qinf->qi_bwarnlimit = ddqp->d_bwarns ?
+ be16_to_cpu(ddqp->d_bwarns) : XFS_QM_BWARNLIMIT;
+ qinf->qi_iwarnlimit = ddqp->d_iwarns ?
+ be16_to_cpu(ddqp->d_iwarns) : XFS_QM_IWARNLIMIT;
+ qinf->qi_rtbwarnlimit = ddqp->d_rtbwarns ?
+ be16_to_cpu(ddqp->d_rtbwarns) : XFS_QM_RTBWARNLIMIT;
+ qinf->qi_bhardlimit = be64_to_cpu(ddqp->d_blk_hardlimit);
+ qinf->qi_bsoftlimit = be64_to_cpu(ddqp->d_blk_softlimit);
+ qinf->qi_ihardlimit = be64_to_cpu(ddqp->d_ino_hardlimit);
+ qinf->qi_isoftlimit = be64_to_cpu(ddqp->d_ino_softlimit);
+ qinf->qi_rtbhardlimit = be64_to_cpu(ddqp->d_rtb_hardlimit);
+ qinf->qi_rtbsoftlimit = be64_to_cpu(ddqp->d_rtb_softlimit);
+
+ xfs_qm_dqdestroy(dqp);
+ } else {
+ qinf->qi_btimelimit = XFS_QM_BTIMELIMIT;
+ qinf->qi_itimelimit = XFS_QM_ITIMELIMIT;
+ qinf->qi_rtbtimelimit = XFS_QM_RTBTIMELIMIT;
+ qinf->qi_bwarnlimit = XFS_QM_BWARNLIMIT;
+ qinf->qi_iwarnlimit = XFS_QM_IWARNLIMIT;
+ qinf->qi_rtbwarnlimit = XFS_QM_RTBWARNLIMIT;
+ }
+
+ qinf->qi_shrinker.shrink = xfs_qm_shake;
+ qinf->qi_shrinker.seeks = DEFAULT_SEEKS;
+ register_shrinker(&qinf->qi_shrinker);
+ return 0;
+}
+
+
+/*
+ * Gets called when unmounting a filesystem or when all quotas get
+ * turned off.
+ * This purges the quota inodes, destroys locks and frees itself.
+ */
+void
+xfs_qm_destroy_quotainfo(
+ xfs_mount_t *mp)
+{
+ xfs_quotainfo_t *qi;
+
+ qi = mp->m_quotainfo;
+ ASSERT(qi != NULL);
+
+ unregister_shrinker(&qi->qi_shrinker);
+
+ if (qi->qi_uquotaip) {
+ IRELE(qi->qi_uquotaip);
+ qi->qi_uquotaip = NULL; /* paranoia */
+ }
+ if (qi->qi_gquotaip) {
+ IRELE(qi->qi_gquotaip);
+ qi->qi_gquotaip = NULL;
+ }
+ mutex_destroy(&qi->qi_quotaofflock);
+ kmem_free(qi);
+ mp->m_quotainfo = NULL;
+}
+
+/*
+ * Create an inode and return with a reference already taken, but unlocked
+ * This is how we create quota inodes
+ */
+STATIC int
+xfs_qm_qino_alloc(
+ xfs_mount_t *mp,
+ xfs_inode_t **ip,
+ __int64_t sbfields,
+ uint flags)
+{
+ xfs_trans_t *tp;
+ int error;
+ int committed;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_QM_QINOCREATE);
+ if ((error = xfs_trans_reserve(tp,
+ XFS_QM_QINOCREATE_SPACE_RES(mp),
+ XFS_CREATE_LOG_RES(mp), 0,
+ XFS_TRANS_PERM_LOG_RES,
+ XFS_CREATE_LOG_COUNT))) {
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+
+ error = xfs_dir_ialloc(&tp, NULL, S_IFREG, 1, 0, 0, 1, ip, &committed);
+ if (error) {
+ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES |
+ XFS_TRANS_ABORT);
+ return error;
+ }
+
+ /*
+ * Make the changes in the superblock, and log those too.
+ * sbfields arg may contain fields other than *QUOTINO;
+ * VERSIONNUM for example.
+ */
+ spin_lock(&mp->m_sb_lock);
+ if (flags & XFS_QMOPT_SBVERSION) {
+ ASSERT(!xfs_sb_version_hasquota(&mp->m_sb));
+ ASSERT((sbfields & (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
+ XFS_SB_GQUOTINO | XFS_SB_QFLAGS)) ==
+ (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
+ XFS_SB_GQUOTINO | XFS_SB_QFLAGS));
+
+ xfs_sb_version_addquota(&mp->m_sb);
+ mp->m_sb.sb_uquotino = NULLFSINO;
+ mp->m_sb.sb_gquotino = NULLFSINO;
+
+ /* qflags will get updated _after_ quotacheck */
+ mp->m_sb.sb_qflags = 0;
+ }
+ if (flags & XFS_QMOPT_UQUOTA)
+ mp->m_sb.sb_uquotino = (*ip)->i_ino;
+ else
+ mp->m_sb.sb_gquotino = (*ip)->i_ino;
+ spin_unlock(&mp->m_sb_lock);
+ xfs_mod_sb(tp, sbfields);
+
+ if ((error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES))) {
+ xfs_alert(mp, "%s failed (error %d)!", __func__, error);
+ return error;
+ }
+ return 0;
+}
+
+
+STATIC void
+xfs_qm_reset_dqcounts(
+ xfs_mount_t *mp,
+ xfs_buf_t *bp,
+ xfs_dqid_t id,
+ uint type)
+{
+ xfs_disk_dquot_t *ddq;
+ int j;
+
+ trace_xfs_reset_dqcounts(bp, _RET_IP_);
+
+ /*
+ * Reset all counters and timers. They'll be
+ * started afresh by xfs_qm_quotacheck.
+ */
+#ifdef DEBUG
+ j = XFS_FSB_TO_B(mp, XFS_DQUOT_CLUSTER_SIZE_FSB);
+ do_div(j, sizeof(xfs_dqblk_t));
+ ASSERT(mp->m_quotainfo->qi_dqperchunk == j);
+#endif
+ ddq = bp->b_addr;
+ for (j = 0; j < mp->m_quotainfo->qi_dqperchunk; j++) {
+ /*
+ * Do a sanity check, and if needed, repair the dqblk. Don't
+ * output any warnings because it's perfectly possible to
+ * find uninitialised dquot blks. See comment in xfs_qm_dqcheck.
+ */
+ (void) xfs_qm_dqcheck(mp, ddq, id+j, type, XFS_QMOPT_DQREPAIR,
+ "xfs_quotacheck");
+ ddq->d_bcount = 0;
+ ddq->d_icount = 0;
+ ddq->d_rtbcount = 0;
+ ddq->d_btimer = 0;
+ ddq->d_itimer = 0;
+ ddq->d_rtbtimer = 0;
+ ddq->d_bwarns = 0;
+ ddq->d_iwarns = 0;
+ ddq->d_rtbwarns = 0;
+ ddq = (xfs_disk_dquot_t *) ((xfs_dqblk_t *)ddq + 1);
+ }
+}
+
+STATIC int
+xfs_qm_dqiter_bufs(
+ xfs_mount_t *mp,
+ xfs_dqid_t firstid,
+ xfs_fsblock_t bno,
+ xfs_filblks_t blkcnt,
+ uint flags)
+{
+ xfs_buf_t *bp;
+ int error;
+ int type;
+
+ ASSERT(blkcnt > 0);
+ type = flags & XFS_QMOPT_UQUOTA ? XFS_DQ_USER :
+ (flags & XFS_QMOPT_PQUOTA ? XFS_DQ_PROJ : XFS_DQ_GROUP);
+ error = 0;
+
+ /*
+ * Blkcnt arg can be a very big number, and might even be
+ * larger than the log itself. So, we have to break it up into
+ * manageable-sized transactions.
+ * Note that we don't start a permanent transaction here; we might
+ * not be able to get a log reservation for the whole thing up front,
+ * and we don't really care to either, because we just discard
+ * everything if we were to crash in the middle of this loop.
+ */
+ while (blkcnt--) {
+ error = xfs_trans_read_buf(mp, NULL, mp->m_ddev_targp,
+ XFS_FSB_TO_DADDR(mp, bno),
+ mp->m_quotainfo->qi_dqchunklen, 0, &bp);
+ if (error)
+ break;
+
+ xfs_qm_reset_dqcounts(mp, bp, firstid, type);
+ xfs_buf_delwri_queue(bp);
+ xfs_buf_relse(bp);
+ /*
+ * goto the next block.
+ */
+ bno++;
+ firstid += mp->m_quotainfo->qi_dqperchunk;
+ }
+ return error;
+}
+
+/*
+ * Iterate over all allocated USR/GRP/PRJ dquots in the system, calling a
+ * caller supplied function for every chunk of dquots that we find.
+ */
+STATIC int
+xfs_qm_dqiterate(
+ xfs_mount_t *mp,
+ xfs_inode_t *qip,
+ uint flags)
+{
+ xfs_bmbt_irec_t *map;
+ int i, nmaps; /* number of map entries */
+ int error; /* return value */
+ xfs_fileoff_t lblkno;
+ xfs_filblks_t maxlblkcnt;
+ xfs_dqid_t firstid;
+ xfs_fsblock_t rablkno;
+ xfs_filblks_t rablkcnt;
+
+ error = 0;
+ /*
+ * This looks racy, but we can't keep an inode lock across a
+ * trans_reserve. But, this gets called during quotacheck, and that
+ * happens only at mount time which is single threaded.
+ */
+ if (qip->i_d.di_nblocks == 0)
+ return 0;
+
+ map = kmem_alloc(XFS_DQITER_MAP_SIZE * sizeof(*map), KM_SLEEP);
+
+ lblkno = 0;
+ maxlblkcnt = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
+ do {
+ nmaps = XFS_DQITER_MAP_SIZE;
+ /*
+ * We aren't changing the inode itself. Just changing
+ * some of its data. No new blocks are added here, and
+ * the inode is never added to the transaction.
+ */
+ xfs_ilock(qip, XFS_ILOCK_SHARED);
+ error = xfs_bmapi_read(qip, lblkno, maxlblkcnt - lblkno,
+ map, &nmaps, 0);
+ xfs_iunlock(qip, XFS_ILOCK_SHARED);
+ if (error)
+ break;
+
+ ASSERT(nmaps <= XFS_DQITER_MAP_SIZE);
+ for (i = 0; i < nmaps; i++) {
+ ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
+ ASSERT(map[i].br_blockcount);
+
+
+ lblkno += map[i].br_blockcount;
+
+ if (map[i].br_startblock == HOLESTARTBLOCK)
+ continue;
+
+ firstid = (xfs_dqid_t) map[i].br_startoff *
+ mp->m_quotainfo->qi_dqperchunk;
+ /*
+ * Do a read-ahead on the next extent.
+ */
+ if ((i+1 < nmaps) &&
+ (map[i+1].br_startblock != HOLESTARTBLOCK)) {
+ rablkcnt = map[i+1].br_blockcount;
+ rablkno = map[i+1].br_startblock;
+ while (rablkcnt--) {
+ xfs_buf_readahead(mp->m_ddev_targp,
+ XFS_FSB_TO_DADDR(mp, rablkno),
+ mp->m_quotainfo->qi_dqchunklen);
+ rablkno++;
+ }
+ }
+ /*
+ * Iterate thru all the blks in the extent and
+ * reset the counters of all the dquots inside them.
+ */
+ if ((error = xfs_qm_dqiter_bufs(mp,
+ firstid,
+ map[i].br_startblock,
+ map[i].br_blockcount,
+ flags))) {
+ break;
+ }
+ }
+
+ if (error)
+ break;
+ } while (nmaps > 0);
+
+ kmem_free(map);
+
+ return error;
+}
+
+/*
+ * Called by dqusage_adjust in doing a quotacheck.
+ *
+ * Given the inode, and a dquot id this updates both the incore dqout as well
+ * as the buffer copy. This is so that once the quotacheck is done, we can
+ * just log all the buffers, as opposed to logging numerous updates to
+ * individual dquots.
+ */
+STATIC int
+xfs_qm_quotacheck_dqadjust(
+ struct xfs_inode *ip,
+ xfs_dqid_t id,
+ uint type,
+ xfs_qcnt_t nblks,
+ xfs_qcnt_t rtblks)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_dquot *dqp;
+ int error;
+
+ error = xfs_qm_dqget(mp, ip, id, type,
+ XFS_QMOPT_DQALLOC | XFS_QMOPT_DOWARN, &dqp);
+ if (error) {
+ /*
+ * Shouldn't be able to turn off quotas here.
+ */
+ ASSERT(error != ESRCH);
+ ASSERT(error != ENOENT);
+ return error;
+ }
+
+ trace_xfs_dqadjust(dqp);
+
+ /*
+ * Adjust the inode count and the block count to reflect this inode's
+ * resource usage.
+ */
+ be64_add_cpu(&dqp->q_core.d_icount, 1);
+ dqp->q_res_icount++;
+ if (nblks) {
+ be64_add_cpu(&dqp->q_core.d_bcount, nblks);
+ dqp->q_res_bcount += nblks;
+ }
+ if (rtblks) {
+ be64_add_cpu(&dqp->q_core.d_rtbcount, rtblks);
+ dqp->q_res_rtbcount += rtblks;
+ }
+
+ /*
+ * Set default limits, adjust timers (since we changed usages)
+ *
+ * There are no timers for the default values set in the root dquot.
+ */
+ if (dqp->q_core.d_id) {
+ xfs_qm_adjust_dqlimits(mp, &dqp->q_core);
+ xfs_qm_adjust_dqtimers(mp, &dqp->q_core);
+ }
+
+ dqp->dq_flags |= XFS_DQ_DIRTY;
+ xfs_qm_dqput(dqp);
+ return 0;
+}
+
+STATIC int
+xfs_qm_get_rtblks(
+ xfs_inode_t *ip,
+ xfs_qcnt_t *O_rtblks)
+{
+ xfs_filblks_t rtblks; /* total rt blks */
+ xfs_extnum_t idx; /* extent record index */
+ xfs_ifork_t *ifp; /* inode fork pointer */
+ xfs_extnum_t nextents; /* number of extent entries */
+ int error;
+
+ ASSERT(XFS_IS_REALTIME_INODE(ip));
+ ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
+ if (!(ifp->if_flags & XFS_IFEXTENTS)) {
+ if ((error = xfs_iread_extents(NULL, ip, XFS_DATA_FORK)))
+ return error;
+ }
+ rtblks = 0;
+ nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+ for (idx = 0; idx < nextents; idx++)
+ rtblks += xfs_bmbt_get_blockcount(xfs_iext_get_ext(ifp, idx));
+ *O_rtblks = (xfs_qcnt_t)rtblks;
+ return 0;
+}
+
+/*
+ * callback routine supplied to bulkstat(). Given an inumber, find its
+ * dquots and update them to account for resources taken by that inode.
+ */
+/* ARGSUSED */
+STATIC int
+xfs_qm_dqusage_adjust(
+ xfs_mount_t *mp, /* mount point for filesystem */
+ xfs_ino_t ino, /* inode number to get data for */
+ void __user *buffer, /* not used */
+ int ubsize, /* not used */
+ int *ubused, /* not used */
+ int *res) /* result code value */
+{
+ xfs_inode_t *ip;
+ xfs_qcnt_t nblks, rtblks = 0;
+ int error;
+
+ ASSERT(XFS_IS_QUOTA_RUNNING(mp));
+
+ /*
+ * rootino must have its resources accounted for, not so with the quota
+ * inodes.
+ */
+ if (ino == mp->m_sb.sb_uquotino || ino == mp->m_sb.sb_gquotino) {
+ *res = BULKSTAT_RV_NOTHING;
+ return XFS_ERROR(EINVAL);
+ }
+
+ /*
+ * We don't _need_ to take the ilock EXCL. However, the xfs_qm_dqget
+ * interface expects the inode to be exclusively locked because that's
+ * the case in all other instances. It's OK that we do this because
+ * quotacheck is done only at mount time.
+ */
+ error = xfs_iget(mp, NULL, ino, 0, XFS_ILOCK_EXCL, &ip);
+ if (error) {
+ *res = BULKSTAT_RV_NOTHING;
+ return error;
+ }
+
+ ASSERT(ip->i_delayed_blks == 0);
+
+ if (XFS_IS_REALTIME_INODE(ip)) {
+ /*
+ * Walk thru the extent list and count the realtime blocks.
+ */
+ error = xfs_qm_get_rtblks(ip, &rtblks);
+ if (error)
+ goto error0;
+ }
+
+ nblks = (xfs_qcnt_t)ip->i_d.di_nblocks - rtblks;
+
+ /*
+ * Add the (disk blocks and inode) resources occupied by this
+ * inode to its dquots. We do this adjustment in the incore dquot,
+ * and also copy the changes to its buffer.
+ * We don't care about putting these changes in a transaction
+ * envelope because if we crash in the middle of a 'quotacheck'
+ * we have to start from the beginning anyway.
+ * Once we're done, we'll log all the dquot bufs.
+ *
+ * The *QUOTA_ON checks below may look pretty racy, but quotachecks
+ * and quotaoffs don't race. (Quotachecks happen at mount time only).
+ */
+ if (XFS_IS_UQUOTA_ON(mp)) {
+ error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_uid,
+ XFS_DQ_USER, nblks, rtblks);
+ if (error)
+ goto error0;
+ }
+
+ if (XFS_IS_GQUOTA_ON(mp)) {
+ error = xfs_qm_quotacheck_dqadjust(ip, ip->i_d.di_gid,
+ XFS_DQ_GROUP, nblks, rtblks);
+ if (error)
+ goto error0;
+ }
+
+ if (XFS_IS_PQUOTA_ON(mp)) {
+ error = xfs_qm_quotacheck_dqadjust(ip, xfs_get_projid(ip),
+ XFS_DQ_PROJ, nblks, rtblks);
+ if (error)
+ goto error0;
+ }
+
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ IRELE(ip);
+ *res = BULKSTAT_RV_DIDONE;
+ return 0;
+
+error0:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ IRELE(ip);
+ *res = BULKSTAT_RV_GIVEUP;
+ return error;
+}
+
+STATIC int
+xfs_qm_flush_one(
+ struct xfs_dquot *dqp)
+{
+ int error = 0;
+
+ xfs_dqlock(dqp);
+ if (dqp->dq_flags & XFS_DQ_FREEING)
+ goto out_unlock;
+ if (!XFS_DQ_IS_DIRTY(dqp))
+ goto out_unlock;
+
+ if (!xfs_dqflock_nowait(dqp))
+ xfs_dqflock_pushbuf_wait(dqp);
+
+ error = xfs_qm_dqflush(dqp, 0);
+
+out_unlock:
+ xfs_dqunlock(dqp);
+ return error;
+}
+
+/*
+ * Walk thru all the filesystem inodes and construct a consistent view
+ * of the disk quota world. If the quotacheck fails, disable quotas.
+ */
+int
+xfs_qm_quotacheck(
+ xfs_mount_t *mp)
+{
+ int done, count, error, error2;
+ xfs_ino_t lastino;
+ size_t structsz;
+ xfs_inode_t *uip, *gip;
+ uint flags;
+
+ count = INT_MAX;
+ structsz = 1;
+ lastino = 0;
+ flags = 0;
+
+ ASSERT(mp->m_quotainfo->qi_uquotaip || mp->m_quotainfo->qi_gquotaip);
+ ASSERT(XFS_IS_QUOTA_RUNNING(mp));
+
+ xfs_notice(mp, "Quotacheck needed: Please wait.");
+
+ /*
+ * First we go thru all the dquots on disk, USR and GRP/PRJ, and reset
+ * their counters to zero. We need a clean slate.
+ * We don't log our changes till later.
+ */
+ uip = mp->m_quotainfo->qi_uquotaip;
+ if (uip) {
+ error = xfs_qm_dqiterate(mp, uip, XFS_QMOPT_UQUOTA);
+ if (error)
+ goto error_return;
+ flags |= XFS_UQUOTA_CHKD;
+ }
+
+ gip = mp->m_quotainfo->qi_gquotaip;
+ if (gip) {
+ error = xfs_qm_dqiterate(mp, gip, XFS_IS_GQUOTA_ON(mp) ?
+ XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
+ if (error)
+ goto error_return;
+ flags |= XFS_OQUOTA_CHKD;
+ }
+
+ do {
+ /*
+ * Iterate thru all the inodes in the file system,
+ * adjusting the corresponding dquot counters in core.
+ */
+ error = xfs_bulkstat(mp, &lastino, &count,
+ xfs_qm_dqusage_adjust,
+ structsz, NULL, &done);
+ if (error)
+ break;
+
+ } while (!done);
+
+ /*
+ * We've made all the changes that we need to make incore. Flush them
+ * down to disk buffers if everything was updated successfully.
+ */
+ if (XFS_IS_UQUOTA_ON(mp))
+ error = xfs_qm_dquot_walk(mp, XFS_DQ_USER, xfs_qm_flush_one);
+ if (XFS_IS_GQUOTA_ON(mp)) {
+ error2 = xfs_qm_dquot_walk(mp, XFS_DQ_GROUP, xfs_qm_flush_one);
+ if (!error)
+ error = error2;
+ }
+ if (XFS_IS_PQUOTA_ON(mp)) {
+ error2 = xfs_qm_dquot_walk(mp, XFS_DQ_PROJ, xfs_qm_flush_one);
+ if (!error)
+ error = error2;
+ }
+
+ /*
+ * We can get this error if we couldn't do a dquot allocation inside
+ * xfs_qm_dqusage_adjust (via bulkstat). We don't care about the
+ * dirty dquots that might be cached, we just want to get rid of them
+ * and turn quotaoff. The dquots won't be attached to any of the inodes
+ * at this point (because we intentionally didn't in dqget_noattach).
+ */
+ if (error) {
+ xfs_qm_dqpurge_all(mp, XFS_QMOPT_QUOTALL);
+ goto error_return;
+ }
+
+ /*
+ * We didn't log anything, because if we crashed, we'll have to
+ * start the quotacheck from scratch anyway. However, we must make
+ * sure that our dquot changes are secure before we put the
+ * quotacheck'd stamp on the superblock. So, here we do a synchronous
+ * flush.
+ */
+ xfs_flush_buftarg(mp->m_ddev_targp, 1);
+
+ /*
+ * If one type of quotas is off, then it will lose its
+ * quotachecked status, since we won't be doing accounting for
+ * that type anymore.
+ */
+ mp->m_qflags &= ~XFS_ALL_QUOTA_CHKD;
+ mp->m_qflags |= flags;
+
+ error_return:
+ if (error) {
+ xfs_warn(mp,
+ "Quotacheck: Unsuccessful (Error %d): Disabling quotas.",
+ error);
+ /*
+ * We must turn off quotas.
+ */
+ ASSERT(mp->m_quotainfo != NULL);
+ xfs_qm_destroy_quotainfo(mp);
+ if (xfs_mount_reset_sbqflags(mp)) {
+ xfs_warn(mp,
+ "Quotacheck: Failed to reset quota flags.");
+ }
+ } else
+ xfs_notice(mp, "Quotacheck: Done.");
+ return (error);
+}
+
+/*
+ * This is called after the superblock has been read in and we're ready to
+ * iget the quota inodes.
+ */
+STATIC int
+xfs_qm_init_quotainos(
+ xfs_mount_t *mp)
+{
+ xfs_inode_t *uip, *gip;
+ int error;
+ __int64_t sbflags;
+ uint flags;
+
+ ASSERT(mp->m_quotainfo);
+ uip = gip = NULL;
+ sbflags = 0;
+ flags = 0;
+
+ /*
+ * Get the uquota and gquota inodes
+ */
+ if (xfs_sb_version_hasquota(&mp->m_sb)) {
+ if (XFS_IS_UQUOTA_ON(mp) &&
+ mp->m_sb.sb_uquotino != NULLFSINO) {
+ ASSERT(mp->m_sb.sb_uquotino > 0);
+ if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_uquotino,
+ 0, 0, &uip)))
+ return XFS_ERROR(error);
+ }
+ if (XFS_IS_OQUOTA_ON(mp) &&
+ mp->m_sb.sb_gquotino != NULLFSINO) {
+ ASSERT(mp->m_sb.sb_gquotino > 0);
+ if ((error = xfs_iget(mp, NULL, mp->m_sb.sb_gquotino,
+ 0, 0, &gip))) {
+ if (uip)
+ IRELE(uip);
+ return XFS_ERROR(error);
+ }
+ }
+ } else {
+ flags |= XFS_QMOPT_SBVERSION;
+ sbflags |= (XFS_SB_VERSIONNUM | XFS_SB_UQUOTINO |
+ XFS_SB_GQUOTINO | XFS_SB_QFLAGS);
+ }
+
+ /*
+ * Create the two inodes, if they don't exist already. The changes
+ * made above will get added to a transaction and logged in one of
+ * the qino_alloc calls below. If the device is readonly,
+ * temporarily switch to read-write to do this.
+ */
+ if (XFS_IS_UQUOTA_ON(mp) && uip == NULL) {
+ if ((error = xfs_qm_qino_alloc(mp, &uip,
+ sbflags | XFS_SB_UQUOTINO,
+ flags | XFS_QMOPT_UQUOTA)))
+ return XFS_ERROR(error);
+
+ flags &= ~XFS_QMOPT_SBVERSION;
+ }
+ if (XFS_IS_OQUOTA_ON(mp) && gip == NULL) {
+ flags |= (XFS_IS_GQUOTA_ON(mp) ?
+ XFS_QMOPT_GQUOTA : XFS_QMOPT_PQUOTA);
+ error = xfs_qm_qino_alloc(mp, &gip,
+ sbflags | XFS_SB_GQUOTINO, flags);
+ if (error) {
+ if (uip)
+ IRELE(uip);
+
+ return XFS_ERROR(error);
+ }
+ }
+
+ mp->m_quotainfo->qi_uquotaip = uip;
+ mp->m_quotainfo->qi_gquotaip = gip;
+
+ return 0;
+}
+
+STATIC void
+xfs_qm_dqfree_one(
+ struct xfs_dquot *dqp)
+{
+ struct xfs_mount *mp = dqp->q_mount;
+ struct xfs_quotainfo *qi = mp->m_quotainfo;
+
+ mutex_lock(&qi->qi_tree_lock);
+ radix_tree_delete(XFS_DQUOT_TREE(qi, dqp->q_core.d_flags),
+ be32_to_cpu(dqp->q_core.d_id));
+
+ qi->qi_dquots--;
+ mutex_unlock(&qi->qi_tree_lock);
+
+ xfs_qm_dqdestroy(dqp);
+}
+
+STATIC void
+xfs_qm_dqreclaim_one(
+ struct xfs_dquot *dqp,
+ struct list_head *dispose_list)
+{
+ struct xfs_mount *mp = dqp->q_mount;
+ struct xfs_quotainfo *qi = mp->m_quotainfo;
+ int error;
+
+ if (!xfs_dqlock_nowait(dqp))
+ goto out_busy;
+
+ /*
+ * This dquot has acquired a reference in the meantime remove it from
+ * the freelist and try again.
+ */
+ if (dqp->q_nrefs) {
+ xfs_dqunlock(dqp);
+
+ trace_xfs_dqreclaim_want(dqp);
+ XFS_STATS_INC(xs_qm_dqwants);
+
+ list_del_init(&dqp->q_lru);
+ qi->qi_lru_count--;
+ XFS_STATS_DEC(xs_qm_dquot_unused);
+ return;
+ }
+
+ /*
+ * Try to grab the flush lock. If this dquot is in the process of
+ * getting flushed to disk, we don't want to reclaim it.
+ */
+ if (!xfs_dqflock_nowait(dqp))
+ goto out_busy;
+
+ /*
+ * We have the flush lock so we know that this is not in the
+ * process of being flushed. So, if this is dirty, flush it
+ * DELWRI so that we don't get a freelist infested with
+ * dirty dquots.
+ */
+ if (XFS_DQ_IS_DIRTY(dqp)) {
+ trace_xfs_dqreclaim_dirty(dqp);
+
+ /*
+ * We flush it delayed write, so don't bother releasing the
+ * freelist lock.
+ */
+ error = xfs_qm_dqflush(dqp, 0);
+ if (error) {
+ xfs_warn(mp, "%s: dquot %p flush failed",
+ __func__, dqp);
+ }
+
+ /*
+ * Give the dquot another try on the freelist, as the
+ * flushing will take some time.
+ */
+ goto out_busy;
+ }
+ xfs_dqfunlock(dqp);
+
+ /*
+ * Prevent lookups now that we are past the point of no return.
+ */
+ dqp->dq_flags |= XFS_DQ_FREEING;
+ xfs_dqunlock(dqp);
+
+ ASSERT(dqp->q_nrefs == 0);
+ list_move_tail(&dqp->q_lru, dispose_list);
+ qi->qi_lru_count--;
+ XFS_STATS_DEC(xs_qm_dquot_unused);
+
+ trace_xfs_dqreclaim_done(dqp);
+ XFS_STATS_INC(xs_qm_dqreclaims);
+ return;
+
+out_busy:
+ xfs_dqunlock(dqp);
+
+ /*
+ * Move the dquot to the tail of the list so that we don't spin on it.
+ */
+ list_move_tail(&dqp->q_lru, &qi->qi_lru_list);
+
+ trace_xfs_dqreclaim_busy(dqp);
+ XFS_STATS_INC(xs_qm_dqreclaim_misses);
+}
+
+STATIC int
+xfs_qm_shake(
+ struct shrinker *shrink,
+ struct shrink_control *sc)
+{
+ struct xfs_quotainfo *qi =
+ container_of(shrink, struct xfs_quotainfo, qi_shrinker);
+ int nr_to_scan = sc->nr_to_scan;
+ LIST_HEAD (dispose_list);
+ struct xfs_dquot *dqp;
+
+ if ((sc->gfp_mask & (__GFP_FS|__GFP_WAIT)) != (__GFP_FS|__GFP_WAIT))
+ return 0;
+ if (!nr_to_scan)
+ goto out;
+
+ mutex_lock(&qi->qi_lru_lock);
+ while (!list_empty(&qi->qi_lru_list)) {
+ if (nr_to_scan-- <= 0)
+ break;
+ dqp = list_first_entry(&qi->qi_lru_list, struct xfs_dquot,
+ q_lru);
+ xfs_qm_dqreclaim_one(dqp, &dispose_list);
+ }
+ mutex_unlock(&qi->qi_lru_lock);
+
+ while (!list_empty(&dispose_list)) {
+ dqp = list_first_entry(&dispose_list, struct xfs_dquot, q_lru);
+ list_del_init(&dqp->q_lru);
+ xfs_qm_dqfree_one(dqp);
+ }
+out:
+ return (qi->qi_lru_count / 100) * sysctl_vfs_cache_pressure;
+}
+
+/*
+ * Start a transaction and write the incore superblock changes to
+ * disk. flags parameter indicates which fields have changed.
+ */
+int
+xfs_qm_write_sb_changes(
+ xfs_mount_t *mp,
+ __int64_t flags)
+{
+ xfs_trans_t *tp;
+ int error;
+
+ tp = xfs_trans_alloc(mp, XFS_TRANS_QM_SBCHANGE);
+ if ((error = xfs_trans_reserve(tp, 0,
+ mp->m_sb.sb_sectsize + 128, 0,
+ 0,
+ XFS_DEFAULT_LOG_COUNT))) {
+ xfs_trans_cancel(tp, 0);
+ return error;
+ }
+
+ xfs_mod_sb(tp, flags);
+ error = xfs_trans_commit(tp, 0);
+
+ return error;
+}
+
+
+/* --------------- utility functions for vnodeops ---------------- */
+
+
+/*
+ * Given an inode, a uid, gid and prid make sure that we have
+ * allocated relevant dquot(s) on disk, and that we won't exceed inode
+ * quotas by creating this file.
+ * This also attaches dquot(s) to the given inode after locking it,
+ * and returns the dquots corresponding to the uid and/or gid.
+ *
+ * in : inode (unlocked)
+ * out : udquot, gdquot with references taken and unlocked
+ */
+int
+xfs_qm_vop_dqalloc(
+ struct xfs_inode *ip,
+ uid_t uid,
+ gid_t gid,
+ prid_t prid,
+ uint flags,
+ struct xfs_dquot **O_udqpp,
+ struct xfs_dquot **O_gdqpp)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_dquot *uq, *gq;
+ int error;
+ uint lockflags;
+
+ if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
+ return 0;
+
+ lockflags = XFS_ILOCK_EXCL;
+ xfs_ilock(ip, lockflags);
+
+ if ((flags & XFS_QMOPT_INHERIT) && XFS_INHERIT_GID(ip))
+ gid = ip->i_d.di_gid;
+
+ /*
+ * Attach the dquot(s) to this inode, doing a dquot allocation
+ * if necessary. The dquot(s) will not be locked.
+ */
+ if (XFS_NOT_DQATTACHED(mp, ip)) {
+ error = xfs_qm_dqattach_locked(ip, XFS_QMOPT_DQALLOC);
+ if (error) {
+ xfs_iunlock(ip, lockflags);
+ return error;
+ }
+ }
+
+ uq = gq = NULL;
+ if ((flags & XFS_QMOPT_UQUOTA) && XFS_IS_UQUOTA_ON(mp)) {
+ if (ip->i_d.di_uid != uid) {
+ /*
+ * What we need is the dquot that has this uid, and
+ * if we send the inode to dqget, the uid of the inode
+ * takes priority over what's sent in the uid argument.
+ * We must unlock inode here before calling dqget if
+ * we're not sending the inode, because otherwise
+ * we'll deadlock by doing trans_reserve while
+ * holding ilock.
+ */
+ xfs_iunlock(ip, lockflags);
+ if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t) uid,
+ XFS_DQ_USER,
+ XFS_QMOPT_DQALLOC |
+ XFS_QMOPT_DOWARN,
+ &uq))) {
+ ASSERT(error != ENOENT);
+ return error;
+ }
+ /*
+ * Get the ilock in the right order.
+ */
+ xfs_dqunlock(uq);
+ lockflags = XFS_ILOCK_SHARED;
+ xfs_ilock(ip, lockflags);
+ } else {
+ /*
+ * Take an extra reference, because we'll return
+ * this to caller
+ */
+ ASSERT(ip->i_udquot);
+ uq = xfs_qm_dqhold(ip->i_udquot);
+ }
+ }
+ if ((flags & XFS_QMOPT_GQUOTA) && XFS_IS_GQUOTA_ON(mp)) {
+ if (ip->i_d.di_gid != gid) {
+ xfs_iunlock(ip, lockflags);
+ if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)gid,
+ XFS_DQ_GROUP,
+ XFS_QMOPT_DQALLOC |
+ XFS_QMOPT_DOWARN,
+ &gq))) {
+ if (uq)
+ xfs_qm_dqrele(uq);
+ ASSERT(error != ENOENT);
+ return error;
+ }
+ xfs_dqunlock(gq);
+ lockflags = XFS_ILOCK_SHARED;
+ xfs_ilock(ip, lockflags);
+ } else {
+ ASSERT(ip->i_gdquot);
+ gq = xfs_qm_dqhold(ip->i_gdquot);
+ }
+ } else if ((flags & XFS_QMOPT_PQUOTA) && XFS_IS_PQUOTA_ON(mp)) {
+ if (xfs_get_projid(ip) != prid) {
+ xfs_iunlock(ip, lockflags);
+ if ((error = xfs_qm_dqget(mp, NULL, (xfs_dqid_t)prid,
+ XFS_DQ_PROJ,
+ XFS_QMOPT_DQALLOC |
+ XFS_QMOPT_DOWARN,
+ &gq))) {
+ if (uq)
+ xfs_qm_dqrele(uq);
+ ASSERT(error != ENOENT);
+ return (error);
+ }
+ xfs_dqunlock(gq);
+ lockflags = XFS_ILOCK_SHARED;
+ xfs_ilock(ip, lockflags);
+ } else {
+ ASSERT(ip->i_gdquot);
+ gq = xfs_qm_dqhold(ip->i_gdquot);
+ }
+ }
+ if (uq)
+ trace_xfs_dquot_dqalloc(ip);
+
+ xfs_iunlock(ip, lockflags);
+ if (O_udqpp)
+ *O_udqpp = uq;
+ else if (uq)
+ xfs_qm_dqrele(uq);
+ if (O_gdqpp)
+ *O_gdqpp = gq;
+ else if (gq)
+ xfs_qm_dqrele(gq);
+ return 0;
+}
+
+/*
+ * Actually transfer ownership, and do dquot modifications.
+ * These were already reserved.
+ */
+xfs_dquot_t *
+xfs_qm_vop_chown(
+ xfs_trans_t *tp,
+ xfs_inode_t *ip,
+ xfs_dquot_t **IO_olddq,
+ xfs_dquot_t *newdq)
+{
+ xfs_dquot_t *prevdq;
+ uint bfield = XFS_IS_REALTIME_INODE(ip) ?
+ XFS_TRANS_DQ_RTBCOUNT : XFS_TRANS_DQ_BCOUNT;
+
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(XFS_IS_QUOTA_RUNNING(ip->i_mount));
+
+ /* old dquot */
+ prevdq = *IO_olddq;
+ ASSERT(prevdq);
+ ASSERT(prevdq != newdq);
+
+ xfs_trans_mod_dquot(tp, prevdq, bfield, -(ip->i_d.di_nblocks));
+ xfs_trans_mod_dquot(tp, prevdq, XFS_TRANS_DQ_ICOUNT, -1);
+
+ /* the sparkling new dquot */
+ xfs_trans_mod_dquot(tp, newdq, bfield, ip->i_d.di_nblocks);
+ xfs_trans_mod_dquot(tp, newdq, XFS_TRANS_DQ_ICOUNT, 1);
+
+ /*
+ * Take an extra reference, because the inode is going to keep
+ * this dquot pointer even after the trans_commit.
+ */
+ *IO_olddq = xfs_qm_dqhold(newdq);
+
+ return prevdq;
+}
+
+/*
+ * Quota reservations for setattr(AT_UID|AT_GID|AT_PROJID).
+ */
+int
+xfs_qm_vop_chown_reserve(
+ xfs_trans_t *tp,
+ xfs_inode_t *ip,
+ xfs_dquot_t *udqp,
+ xfs_dquot_t *gdqp,
+ uint flags)
+{
+ xfs_mount_t *mp = ip->i_mount;
+ uint delblks, blkflags, prjflags = 0;
+ xfs_dquot_t *unresudq, *unresgdq, *delblksudq, *delblksgdq;
+ int error;
+
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL|XFS_ILOCK_SHARED));
+ ASSERT(XFS_IS_QUOTA_RUNNING(mp));
+
+ delblks = ip->i_delayed_blks;
+ delblksudq = delblksgdq = unresudq = unresgdq = NULL;
+ blkflags = XFS_IS_REALTIME_INODE(ip) ?
+ XFS_QMOPT_RES_RTBLKS : XFS_QMOPT_RES_REGBLKS;
+
+ if (XFS_IS_UQUOTA_ON(mp) && udqp &&
+ ip->i_d.di_uid != (uid_t)be32_to_cpu(udqp->q_core.d_id)) {
+ delblksudq = udqp;
+ /*
+ * If there are delayed allocation blocks, then we have to
+ * unreserve those from the old dquot, and add them to the
+ * new dquot.
+ */
+ if (delblks) {
+ ASSERT(ip->i_udquot);
+ unresudq = ip->i_udquot;
+ }
+ }
+ if (XFS_IS_OQUOTA_ON(ip->i_mount) && gdqp) {
+ if (XFS_IS_PQUOTA_ON(ip->i_mount) &&
+ xfs_get_projid(ip) != be32_to_cpu(gdqp->q_core.d_id))
+ prjflags = XFS_QMOPT_ENOSPC;
+
+ if (prjflags ||
+ (XFS_IS_GQUOTA_ON(ip->i_mount) &&
+ ip->i_d.di_gid != be32_to_cpu(gdqp->q_core.d_id))) {
+ delblksgdq = gdqp;
+ if (delblks) {
+ ASSERT(ip->i_gdquot);
+ unresgdq = ip->i_gdquot;
+ }
+ }
+ }
+
+ if ((error = xfs_trans_reserve_quota_bydquots(tp, ip->i_mount,
+ delblksudq, delblksgdq, ip->i_d.di_nblocks, 1,
+ flags | blkflags | prjflags)))
+ return (error);
+
+ /*
+ * Do the delayed blks reservations/unreservations now. Since, these
+ * are done without the help of a transaction, if a reservation fails
+ * its previous reservations won't be automatically undone by trans
+ * code. So, we have to do it manually here.
+ */
+ if (delblks) {
+ /*
+ * Do the reservations first. Unreservation can't fail.
+ */
+ ASSERT(delblksudq || delblksgdq);
+ ASSERT(unresudq || unresgdq);
+ if ((error = xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
+ delblksudq, delblksgdq, (xfs_qcnt_t)delblks, 0,
+ flags | blkflags | prjflags)))
+ return (error);
+ xfs_trans_reserve_quota_bydquots(NULL, ip->i_mount,
+ unresudq, unresgdq, -((xfs_qcnt_t)delblks), 0,
+ blkflags);
+ }
+
+ return (0);
+}
+
+int
+xfs_qm_vop_rename_dqattach(
+ struct xfs_inode **i_tab)
+{
+ struct xfs_mount *mp = i_tab[0]->i_mount;
+ int i;
+
+ if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
+ return 0;
+
+ for (i = 0; (i < 4 && i_tab[i]); i++) {
+ struct xfs_inode *ip = i_tab[i];
+ int error;
+
+ /*
+ * Watch out for duplicate entries in the table.
+ */
+ if (i == 0 || ip != i_tab[i-1]) {
+ if (XFS_NOT_DQATTACHED(mp, ip)) {
+ error = xfs_qm_dqattach(ip, 0);
+ if (error)
+ return error;
+ }
+ }
+ }
+ return 0;
+}
+
+void
+xfs_qm_vop_create_dqattach(
+ struct xfs_trans *tp,
+ struct xfs_inode *ip,
+ struct xfs_dquot *udqp,
+ struct xfs_dquot *gdqp)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+
+ if (!XFS_IS_QUOTA_RUNNING(mp) || !XFS_IS_QUOTA_ON(mp))
+ return;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(XFS_IS_QUOTA_RUNNING(mp));
+
+ if (udqp) {
+ ASSERT(ip->i_udquot == NULL);
+ ASSERT(XFS_IS_UQUOTA_ON(mp));
+ ASSERT(ip->i_d.di_uid == be32_to_cpu(udqp->q_core.d_id));
+
+ ip->i_udquot = xfs_qm_dqhold(udqp);
+ xfs_trans_mod_dquot(tp, udqp, XFS_TRANS_DQ_ICOUNT, 1);
+ }
+ if (gdqp) {
+ ASSERT(ip->i_gdquot == NULL);
+ ASSERT(XFS_IS_OQUOTA_ON(mp));
+ ASSERT((XFS_IS_GQUOTA_ON(mp) ?
+ ip->i_d.di_gid : xfs_get_projid(ip)) ==
+ be32_to_cpu(gdqp->q_core.d_id));
+
+ ip->i_gdquot = xfs_qm_dqhold(gdqp);
+ xfs_trans_mod_dquot(tp, gdqp, XFS_TRANS_DQ_ICOUNT, 1);
+ }
+}
+